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Stereocaulon dactylophyllum Flörke


Thallus pale green-grey to grey, initially squamulose but then, in its typical form, with tufts of ascending to erect branches (pseudopodetia), to 4cm or more, bearing clusters of cylindrical, finger-like to coralloid phyllocladia and, sometimes, small, wrinkled, irregularly globose, brown-grey clusters of cephalodia, soredia absent; thallus testing orange with Pd (para-phenylenediamine); apothecia frequent, orange- to dark brown, on tips of terminal and side-branches. On siliceous and metalliferous rocks, mainly in the north and west, locally common in upland areas but can be overlooked amongst S. vesuvianum colonies. Description applies to var. dactylophyllum.

Refs: Smith et al. (2009), 861; Purvis et al. (1992), 579; Dobson (2005), 415 (photo); Dobson (2011), 420-1 (photo); Jahns (1983), 224-5 (photos, fig. 520 is var. dactylophyllum, fig 517 is apparently var. occidentale); Krog et al. (1994), 279 (photo); Moberg & Holmåson (1984), 150 (photo); Holien & Tønsberg (2008), 97 (photo); Stenroos et al. (2011), 432 (photo); Wirth (1995), 2: 877, 878 (photo); Wirth et al. (2004), 67 (photo); Wirth, Hauck & Schulz (2013), 2: 1067 & 1069 (photo), 1068; Hinds & Hinds (2007), 455 (photo); Brodo et al. (2001), 665 (photo); Pope (2005), 20 (photos).

Stereocaulon dactylophyllum
Stereocaulon dactylophyllum
Stereocaulon dactylophyllum, enlarged view
Stereocaulon dactylophyllum, cephalodia
On stones on heathy roadbank, Kilchrenan, Argyllshire, December 2009. Lowest photograph shows a cluster of cephalodia.


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Uploaded August 2012, updated August 2013